Telephonic transmitting appliance.



J. K. RHODES.

TELEPHONIO TRANSMITTING APPLIANCE.

APPLIOATIQN FILED APR. 6, 1912.

1,039,443, Patented Sept. 24, 1912.

INVENTOI? WITNESSES "I g B) M M momm 50 transmitting appliances of single trans- UNITED s'rarrns PATENT ornicn JOHN K. RHODES, 0F BROOKLYN, NEW YQRK, ASSIGNOR T0 KELLEY MONROE TURNER, OF JAMAICA, NEW YORK.

T'ELEPHONIC TRANSMITTIIIG APPLIANCE.

Loaders.

Specification of Letters Patent. Patented Sept, 24,1912.

Application filed April 6, 1912. Serial No. 688,861.

To all whom it may concern:

Be it known that I, JOHN K. Rnonns, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in a Tele phonic Transmitting Appliance, of which the following is a specification.

This invention relates to telephonic apparatus for the deaf and specifically to a transmitting appliance to be worn as an attachment to the clothing or apparel.

Telephonic service for deaf persons should be adapted to loud voices and soft voices and to near and far conditions, so that it is not possible to dispense with considerable delicate apparatus such as has formed the subject of various prior patents in this branch of the art. The popular taste is, however, against bulky and apparently complicated apparatus as an attachment to personal apparel, and deaf persons are sensitive to appliances which give them a switch-board appearance. Accordingly at tempt-s have been made to combine a telephonic transmitter of great sensitiveness with an apparatus for regulating the sensitiveness so as to suit all conditions of practice, and yet make the outfit simple in appearance and not suggestive of electrical switch-board apparatus. The present invention provides an improved apparatus of this character.

In the drawings,-Figure 1. is a front view partly broken away of a telephonic transmitting implement embodying the principles of this invention; Fig. 2, is a rear view, and Fig. '3, is a sectional view showing a detail.

Constructions embodying the invention will primarily include a casing 1, the front of'which is plain except for a plurality of sound openings 2 as illustrated, and in order to get the great sensitiveness which is to reproduce the faintest sounds, two transmitters 3 of the general typeset forth in the patent to Hatf 874,004 or Hyde 711,974 are grouped. side by side so touch. This provides substantially as great sensitiv eness as with two separate complete mitter type, and at the same time obtains a compact arrangement. The general result is that the oval character of t e instrument permits it to hang down when attached for that they almost: parallel to the example to the edge of a coat pocket, but it does not hang down so far as to vibrate with any pendulum effect which would be objectionable. The edge of the back of the instrument has a which produces an interior configuration which cooperates in the sound producing functions and also gives the instrument a much thinner appearance than it would otherwise have.

The means for toning down the extreme..

sensitiveness of the instrument constitutes an important and distinctive feature of the invention n the fact that it occupies interiorly a space which is available without 70 diminishing the efficiency of the operation on the one hand or increasing the bulk on the other. Besides this the regulating means occupies exterior-1y a position which is endeep bevel or chamber 5 tirely concealed, but which is as accessiblev to hand manipulation as possible, being in fact so located as to be readily graspc by the hand.

Reference has been made to the fact that the bottom of the instrument as well as the top is semicircular; Also to the fact that directly inside of this semi-circular bottom a of the instrument there is an annular'space 4. Constructions embodying the inventlon will therefore include a plurality of resistance coils in the annular space 4 just mentioned, arranged in series betweenstuds 6 which project through the rear of the casing in an arcuate formation 7 generally corresponding o the shape of the instru? ment at this end and also to the shape 0 the internal cavity 4 the studs occupying perhaps about 120 degrees of angular extent. There is also a switch arm 8 which is centrally pivoted at 9'and swings over the contacts mentioned. The extremity of this arm will project and be turned upward in order to provide for convenient manipulation of the resistance arm which can be swung easy engagement of the fingers, on account of the fact that its movement is generally edge of theiinstrument, and equally accessible in all directions, or substantially so arm pivot 9 is not exactly concentric with the'edge and with the central conical stud a construction is illustrated 10, but in Fig. 3 by which the conical stud 10 may be made a part of the support for the pivot 9 and be 110 througlr its entire range by an In Figs. 1 and'2 the switch connections, -through the resistance coils and through the switch arm 8 in a series circuit with the transmitters, this being readily understood exactly concentric therewith. For this purpose the stud is made of sheet metal with a lower edge or lips folded inward over a disk or washer 11. This washer has a threaded hole to receive the pivot 9;

It is unnecessary to refer to the electrical which are made in series tween the transmitter and the casing, resistance coils within said cavlty and 00116611 trically arranged around said transmitter for about a third of its periphery, and a swinging arm concentrically pivoted with Copies of this patent may be obtained for New York and State of New York respect to said transmitter on the back of the casing adapted to cut in and' cut out'the various resistance coils by a movement generally parallel to said rounded edge, whereby said arm is both concealed and accessible in all positions.

2. A telephonic transmitting appliance for deaf persons, comprising a palr of trans mitters, an oval casing having rounded ends and provlded with annular spaces surrounding the transmitters, resistance coils in the annular. space atone'end, and a swinging arm on said end of the instrument on the rear face thereof adapted to cut in and cut out the various resistance coils, said arm having a handle extremity with a movement in the same arcuate direction as said rounding edge.

Signed at New York, in the county of this 2nd day of April, A. D. 1912.

J OHN. K. RHODES.

Witnesses;

HERMINE DUNEELD,

WM. D. COLE. I

Washington, G. v

five cents each", by addressing the Commissioner of Patents, 

